| 二进制数控电桥测室温 |
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| 引用本文： | 刘伟,张昌民,郭立新,李平舟.二进制数控电桥测室温[J].大学物理实验,2014(5):13-15. |
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| 作者姓名： | 刘伟 张昌民 郭立新 李平舟 |
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| 作者单位： | 西安电子科技大学,陕西 西安,710071 |
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| 基金项目： | 陕西省高等教育教学改革重点研究项目，西安电子科技大学新实验开发与新实验设备研制及实验教学改革项目 |
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| 摘 要： | 传统惠斯登电桥受限于电阻箱的测量精度,往往无法准确测量温度。根据二进制数控R-2R电阻网络的伏安特性,把R-2R电阻网络作为惠斯登电桥的比例臂,通过12个手动开关（或者360度旋转编码器）调节比例臂电阻的比值以实现电桥的平衡。并通过运算放大器调节检流计灵敏度以测量PT100的阻值,从而实现对室内温度的精确测量。
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| 关 键 词： | 二进制数控电桥 测温 PT100 精度 |
Measurement on Indoor Temperature by Binary Digital Bridge |
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| LIU Wei,ZHANG Chang-min,GUO Li-xin,LI Ping-zhou.Measurement on Indoor Temperature by Binary Digital Bridge[J].Physical Experiment of College,2014(5):13-15. |
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| Authors: | LIU Wei ZHANG Chang-min GUO Li-xin LI Ping-zhou |
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| Institution: | ( Xidian University, Shanxi Xi＇ an 710071 ) |
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| Abstract: | It is difficult to measure the precision indoor temperature with traditional Wheatstone bridge limited by measurement precision of the resistance box. According to the volt ampere characteristic of the Binary Digital R-2R resistor network,the balance of the bridge is realized by 12 manual switch（ or 360 degree rotary encoder） to change the arm resistance which is the R-2R resistor network. The resistance of the PT100 is measured by the operational amplifier which raised the galvanometer sensitivity,so the accurate measurement of the indoor temperature is achieved. |
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| Keywords: | binary digital bridge temperature P T100 precision |
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